29 June 2012, Volume 43 Issue S1
    

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  • Research progresses of MWCNTs modified LiFePO4 cathode material for Li-ion Batteries
    gai yang;; ;;
    . 2012, 43(S1): 1-0.
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    lithium iron phosphates (LiFePO4) has been regarded as a promising cathode material for lithium-ion batteries due to its advantages of low cost, low toxicity, excellent thermal stability and good cycling property. The major issue with LiFePO4 is its lower electronic conductivity. Carbon nanotubes (CNTs) with excellent electrical conductivity can improve the conductivity of cathode material. In this paper, we reviewed the research progresses of CNTs modified LiFePO4 cathode material in recent years from a variety of modified methods. Most researchers believe that CNTs play a role in connecting the cathode material particles due to the introduction of MWCNTs. The efficient electronic conductive three-dimensional network can improve the poor conductivity of pure LiFePO4 cathode material significantly. Finally, we reviewed the problems that still exist in the MWCNTs modified LiFePO4 cathode material.
  • Review on Development of Stabilized Blue-phase Liquid Crystals
    Ning LI;;;;;
    . 2012, 43(S1): 2-0.
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    A unique ‘double-twisted’ structure of blue-phase liquid crystal is introduced. The formation of its 3 dimensional lattice is explained as well. The principles and advantages of blue-phase liquid crystals working in a display device are illustrated. Methods of widening the blue phase temperature range are categorized and discussed in details, including polymer stabilization, nano particles stabilization, ‘banana’ shape and ‘T’ shape molecular induced-stabilization, bimesogen molecular and hydrogen bonds stabilization. At last, the prospect of blue-phase liquid crystals application in display field is analyzed.
  • Recent Progress in Polyurethane Vascular Grafts
    . 2012, 43(S1): 3-0.
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    ABSTRACT: Because of the excellent mechanical properties and biocompatibility, polyurethanes (PUs) have been widely used in biomedical filed, such as artificial organs, drug release carriers, and vascular grafts. Specifically, their in vivo inflammation, repeatedly thrombogenicity and chronic intimal hyperplasia hindered the success of PU vascular grafts. Therefore, the biocompatibility, haemocompatibility, and cells compatibility of PUs should be improved. In this article, the main methods to improve the in vivo performances of PU vascular grafts are reviewed, including bulk modification, surface polymer grafting, plasma treatment, surface coating, and so on.
  • Research progress in organic/composite phase change materials for energy storage
    ;Xiao-Feng HU;
    . 2012, 43(S1): 4-0.
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    Phase change materials (PCMs) store or release energy in the phase change process. In recent years, it is becoming a heated topic because of their excellent properties. In this article, classification, characteristics and evaluation criteria of organic/composite PCMs are systematically illustrated, and some preparation methods of organic/composite PCMs are introduced, such as in-situ polymerization, interfacial polymerization, spray drying method, porous materials adsorption method, sol-gel method, etc. Also, this review presents some applications of PCMs in solar energy, construction, air conditioning, industrial waste heat recovery, military stealthy, and so on. Finally, the development of PCMs is discussed.
  • The Developments of the High Valent Cation Conducting Solid Electrolytes
    Ling Wang
    . 2012, 43(S1): 5-0.
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    The high valent cation conducting solid electrolytes have a great potential for applications, such as gaseous sensors, fuel cells and so on, it is considered as a promising electrolytes materials. These materials have attracted considerable attention as a new material. The recent developments of the high valent cation conducting solid electrolytes, especially the aluminum ion solid electrolyte and application, existent issue, as well as the direction of development of the high valent cation conducting solid electrolytes were summarized in the present paper.
  • The Recognition Mechanism and Evaluation Method of Molecular Imprinting Technique Based on β-Cyclodextrins
    ;Qiu-Jin ZHU
    . 2012, 43(S1): 6-0.
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    β-Cyclodextrin (β-CD) is a widely used high biocompatibility supramolecular compounds. If human control binding sites of β-CD molecular imprinting technology, we could increase the guest molecules’ combining efficiency and choice and contribute to the synthesis of intelligent host molecules. β-CD is a industrialized products with low costs, and its cavity dimensions is moderate, so it has been used in solid phase extraction, analysis, molecular recognition of Chiral separation, chromatography and sensor materials and so on. Molecular imprinting technique based on β-CD combine supramolecular chemistry, macromolecular chemistry and analytical chemistry together to promote the development of molecular imprinting technology. Here, we will review the recent development of molecular imprinting technology based on β-CD. The first part describes the fundamentals of molecular imprinting technology based on β-CD and respectively from cross-linking agent, template molecular size and solvent to expound its recognition mechanism. The second part introduces the selective evaluation of MI-β-CDs from electrochemical method, and spectrum method, and color spectrum method and static adsorption method. At last, the prospects in this field are pointed out.
  • The Development of Research Progress on Oxidation of Iron Aluminides lntermetallics at High Temperature
    Ping TAN
    . 2012, 43(S1): 7-0.
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    Iron Aluminides lntermetallics are regarded as the new importan application valuable materials for the field of high temperature structure materials and gas cleaning materials, due to their good mechanical property, oxidation resistance and sulfide resistance at high temperature. This paper discussed the process and mechanism of its oxidation.
    • 研究与开发
  • Active Mechanism of Low-temperature sintering to UO2+x Pellets
    Rui LI
    . 2012, 43(S1): 8-0.
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    Low-temperature sintering experiments of UO2+x pellets and the results were reported in this paper. 12 groups pellets were sintered in vertical molybdenum wire furnace with N2+CO2 partially-oxidative atmosphere. Densities which achieved 10.41g?cm-3 (94.98% Theoretical Density) could be sintered at a much lower temperature (more than 400K) while UO2 pellets were sintered at 2073K-2273K in hydrogen. A defect model of hyper-stoichiometry uranium dioxide was built for studying the active mechanism. The diffusion coefficient was positive to partial pressure of oxygen (Po2) or excess oxygen ions (x in UO2+x). The sintered densities of UO2+x pellets were predicted by diffusion coefficient of uranium ions at 1073K, 1273K, 1473K and 1673K. The theoretical sintering temperature of UO2+x in partially-oxidative atmosphere was also calculated when x is 0.04. The results of sintered densities and sintering temperature were agreed to experimental results very well.
  • The effect of hot-deformation temperature on the magnetic properties of magnets made by single-stage hot-deformation
    An-Ruo ZHOU
    . 2012, 43(S1): 9-0.
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    Bulk anisotropic Nd-Fe-B magnets were prepared by single-stage hot-deformation technique. Effects of hot-deformation temperature on the density, anisotropic, magnetic properties and microstructure were studied. The results showed that the densification of magnets was difficult and the degree of c-axis texture was low when temperature was lower than 700℃, thus the magnetic properties were low; when the temperature was higher than 750℃, the magnetic properties of hot-deformed magnets were low since the grains were coarse and the degree of texture was low. When hot-deformation temperature was about 700℃-750℃, the magnets with optimum properties were obtained. After hot-deformation at 700℃, the magnetic energy product increased to 232kJ/m3.
  • Research on the four-step foam forming mechanism of biomass materials
    An-Fu GUO
    . 2012, 43(S1): 10-0.
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    At present，the research related biomass materials has become a hot topic. In this paper, the four-step foam forming mechanism which was made up of raw material blending stage, bubble nucleation stage, bubble growth stage and curing finalization stage was first put forward according to the foam forming problem of biomass materials. In the raw material blending stage, the phase transition mechanism and existence form of plant fiber was analyzed. In bubble nucleation stage, the homogeneous nucleation mechanism and influencing factors of nucleation quality were presented. In the bubble growth stage, the force analysis and transformation mechanism of bubble was discussed. In the curing finalization stage, the influencing factors of curing finalization, such as curing time and curing rate, were studied.
  • The Influence of Magnesium Hydroxide Sulfate Whisker on the properties of Liquid Silicone Rubber
    ZHANG Xiao Ying
    . 2012, 43(S1): 11-0.
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    Taking two-component additional liquid silicone rubber (LSR) as base rubber, silica white carbon black as reinforcing packing material. Analyze and compare the combustion performance and mechanical properties of four flame retardant liquid silicone rubber compound, including aluminum hydroxide, magnesium hydroxide, Magnesium Hydroxide Sulfate Whisker, the stearic acid sodium surface treatment of magnesium Hydroxide Sulfate Whisker. The results show that the stearic acid sodium surface treatment of magnesium Hydroxide Sulfate Whisker can improve the tensile strength of LSR, and have a unique advantage in improving the flame resistance of LSR.
  • Heavily doped Si film prepared by electron beam evaporation and its application in Low-e glass
    ;Yanwei Huang ;;
    . 2012, 43(S1): 12-0.
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    Heavily doped Si films were prepared by electron beam evaporation on conventional glass. The properties, surface morphologies, composition and optical transmission, were characterized and analyzed through SEM, EDS and spectra. Furthermore, the deposited heavily doped Si films were treated by the method of Al-induced low-temperature crystallization with firstly deposited Al film on glass substrate. The XRD measurement, electrical and optical properties testing results revealed that when the temperature is above 300℃, the peak Si(111) appeared and electrical conductance increases of the Si film. Meanwhile, the crystallized Si film processes good visible light transmission, with enhanced heat reflective properties, which indicates that these Si films have potential application value in low-emissivity glass. Moreover, the Ag-based low-e glass with the structure of glass/Si/Ag/Si was prepared by electron beam evaporation and a series of testing results showed Si film can protect the low-e film in some condition.
  • Precursor particle size control and active magnesia powder Preparation
    wangluming
    . 2012, 43(S1): 13-0.
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    With brine and lime as raw material, adopting Seed crystal circulation growth for the control of different particle size of magnesium hydroxide precipitate, respectively in different thermal system decomposition and preparation of magnesia powder, study on precursor particle size and magnesium oxide activity relationship. The results show that, a small particle size of magnesium hydroxide (only one quick reaction to obtain ) in lower decomposition temperature ( such as 500-600C ) and appropriate decomposition of the time (4 hours) conditions, the prepared magnesium oxide with high sintering activity, thereby obtaining high temperature sinter- magnesia with high compactness ( volume density of 3.47g / cm3).
  • Experimental Research of Producing Slag Wool with Modified Blast Furnace Slag as Raw Materials
    . 2012, 43(S1): 14-0.
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    The composition change of molten slag, adding different proportions of waste iron ore or fly ash, was studied, and the impact mechanism of molten slag as a raw material preparation slag wool was analyzed. The results show that, with the increase of waste iron ore or fly ash proportion, the total content of SiO2 and Al2O3 in the molten slag increases gradually , the content of CaO、MgO、Fe2O3、FeO、K2O and Na2O decreases, the acidity coefficient Mk and viscosity coefficient Mη value of molten slag increase, hydrogen ion index pH decreases, slag viscosity increases, but viscosity in the high temperature zone changes a little, so it is conducive to produce slag wool fiber.
  • A Composite Pore-forming Technology for the Preparation of the Ultra-low-density Block Porous Gold
    Xun WANG; ;;Hu TIAN
    . 2012, 43(S1): 15-0.
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    In this paper, aluminium microspheres were used as templates,and the Al/Au compound microspheres with core-shell structure were prepared by electroless gold plating. Then alloying happened between the gold player and the surface of the base aluminium powders during the Spark Plasma Sintering (SPS) process. So block precursor with Al/Al-Au alloy core-shell structure was fabricated. Finally, block porous gold was got after the aluminium templates were etched with a two-step route, while the dealloying of the Al-Au alloy player happened in the same time. Emphasis is placed on optimizing the technical parameters of electroless gold plating, so as well the variation of the phases and constituents in the process of sintering and corrosion. All of these process were characterized by XRD, SEM and EDS. It was found that the activation and reductant had great effects on the result of the electroless plating. The block porous gold prepared in this way had two-stage holes: nano holes(80～120nm) and micron holes(1～10um), which also had uniform microstructure with a density as low as 0.39g/cm3 and a porosity of 98%.
  • Preparation and characterization of tourmaline/chitosan composite fiber
    Jun-feng LI ;Qu Ke Hui;;;;;
    . 2012, 43(S1): 16-0.
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    Tourmaline/chitosan (Tur/CS) composite fiber was prepared by solution spinning. The properties of composite fiber was characterized by optical microscope, SEM, XRD, IR, far-infrared emissivity, contact angle testing, absorbing water rate and preserving water rate. The results show that the tourmaline particles wrapped by chitosan are fully dispersed in the composite fiber. There are no bare tourmaline particles on the surface of the composite fiber. The tourmaline particles block arrangement of the molecular chain of chitosan, so the crystalline regions of chitosan in composite fiber reduce. The amide II band at 1552cm-1 of composite fiber increased. The far infrared emissivities of composite fiber of tourmaline and chitosan quality ratio for 0.1, 0.2 and 0.5 achieve 0.919, 0.900 and 0.921 respectively.
  • The influence of carbon nanotubes on the mechanical properties of carbon fiber/epoxy composites
    . 2012, 43(S1): 17-0.
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    To study the influence of carbon nanotubes (CNTs) on the mechanical properties and fatigue life on the carbon fiber/epoxy (CF/ER) composites, the static tensile test and tension-tension fatigue test has been carried out in the fiber direction of composites, and the X-ray analysis and SEM observation are used in the present paper. The results show that the addition of CNTs can not affect the mechanical properties of CF/ER composites apparently in the tensile test, but it can improve its fatigue life remarkably. The results also show that the addition of CNTs can decrease the crack density more than 9.5% at various experimental stresses, and the pulled or broken CNTs and cracks bridged by CNTs can be observed apparently in the experiment samples. From these results, it can be seen that the CNTs can be used to improve the mechanical properties and fatigue life of the CF/ER composites.
  • Properties of Sn-doped Barium Zirconate Titanate Films
    Xiao-Ming DENG
    . 2012, 43(S1): 18-0.
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    The Sn-doped (BaZr0.2Ti0.8)O3(BZT) films were prepared by sol-gel processing on Pt/Ti/SiO2/Si substrates. The results show that the films belong to the perovskite phase. There is a second phase(BaO) when the Sn-doped content is more than 4%. SEM show that the surface morphology of BZT films is smooth and there is a little holes and cracks. The BZT film had the highest dielectric constant and lower loss when the Sn-doped content increased to 8%. The addition of the remanent polarization is 2.29μC/cm2 and the coercive field is 10.36KV/cm.
  • Effect of high temperature annealing on the magnetic properties of Fe-Co alloys with high saturation magnetic induction
    ;Yilong Masun jian chun
    . 2012, 43(S1): 19-0.
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    Effect of high temperature annealing on the quality and magnetic properties of Fe-Co alloys with high saturation magnetic induction was studied. The results showed that the quality and magnetic properties did not change significantly when the alloy annealed below 500℃. However, the quality increased and the magnetic properties decreased significantly when the alloy annealed over 600℃. When annealed at 500℃ for 4h, BS of alloys decreased to 2178mT and Hc increased to 76.1A/m. The study of microstructure revealed that the effect of high temperature annealing on the grain of alloys was small, and the surface of alloys consisted of Fe3O4. The decreasing of magnetic properties for Fe-Co alloys after high temperature annealing may due to the increase of oxides and impurities.
  • Study on effect of vibration on aerospace Fe-Co soft magnets
    Yilong Masun jian chun
    . 2012, 43(S1): 20-0.
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    The orthogonal experiment was used to simulate aerospace environment vibration of 1J22 Fe-Co soft magnets, and the magnetic properties and microstructure of alloys after vibration were studied. The results indicate that the effect of vibration factors such as acceleration, frequency and time, on the magnetic properties is little. After vibration, Br and Hc increase, however, they are still within a required limit. The study on the microstructure indicates that the crystal structure and grain size of alloys does not change after vibration, however, the internal stress increases for alloys after vibration, which leads to increasing resistance of domain wall motion, thus Br and Hc increase.
  • Effects of mixed abrasives on the CMP quality of sapphire substrate
    Jiang-Yong YU
    . 2012, 43(S1): 21-0.
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    The mechanism of the mixed abrasives is analyzed and the SiO2 abrasive is compared with the mixed abrasives on the sapphire substrate removal rate. The result shows that adding nm grade alumina with the concentration of 20ml / L in the main abrasive can make the chemical action balance with the mechanical action in the CMP process so that the substrate removal rate is well improved.During the final 5-10 minutes, the surface roughness can be reduced to 0.236nm by adjusting the process parameters and slurry ratio.
  • Influence of heat treatment on structure and properties of step-forged shaft
    Li Yong You
    . 2012, 43(S1): 22-0.
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    The effect of heat treatment on structure and properties of step-forged shaft are studied.The result indicated,when the heat treatment temperature changed a little,the grain boundaries appear different microstructure,and influence the properties of the alloy. In order to meet the requirements of the use of step-orged shaft,using the reasonable heat treatment temperature, The tensile strength and impact toughness are optimal matching.
  • First-principles Study on Doped Property of Fe-doped BaTiO3
    Qing-Long GUO
    . 2012, 43(S1): 23-0.
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    The structures and electronic structures of Fe-doped BaTiO3 are calculated and studied using the full potential augmented plane wave and local orbital method within density functional theory. we give attention to ferromagnetism on Fe-doped BaTiO3. Fe doping in BaTiO3 ceramic material can not only increase the dielectric property but also produce new performance of ferromagnetism. To research microcosmic principium, electronic structures of pure BaTiO3 have been investigated.Next electronic structures of supercell of BaTi0.5Fe0.5O3 have been calculated. Result reveal that,with doping Fe the material be provided with magnetism. Compared DOS of Fe with DOS of O,the hybridizations of Fe-3d and O-2p is occur. This indicate that covalent bond and electrovalent bond are coexistence. Electronic structures indicate pure BaTiO3 ceramic material is well insulator before doped,but it occurred metallic after doped.
  • Preparation of chitosan composite film and its functionalization for biomolecules
    Cuili XIANG
    . 2012, 43(S1): 24-0.
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  • Test method of shielding effectiveness based on the shielding enclosure for plane materials
    Feng LIU
    . 2012, 43(S1): 25-0.
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    According to the present properties of some new plane shielding materials and the shortages of standard test methods, Two test methods of shielding effectiveness based on the shielding enclosure for plane materials were described in this paper. And these have offered perfect test facility for the performance test of shielding materials, and have supplied test channel for accurately evaluating the shielding effectiveness of materials. What’s more, these will provide test platform for the couple of aperture and detection of protecting equipments. some actual applied experiments have proved reasonability and the validity of testing methods.
  • Up conversion luminescence of La3+/ Yb3+/ Er3+ co-doped titanium dioxide with 1064nm excitation
    Jian-Guo DENG
    . 2012, 43(S1): 26-0.
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    The up conversion luminescence materials of the oxide matrix have good characteristics and have enormous potential application with the depth of the up-conversion materials research. The powders TiO2 co-doped with La3+, Er3+and Yb3+ ions were prepared by sol-gel process and co-precipitation in this work. The characteristics of these materials were investigated with SEM, XRD. And the up-conversion luminescence properties of TiO2 co-doped with different rare earth concentration and calcinations temperatures were investigated under a 1064 nm LD excitation. The La3+, Yb3+ and Er3+ co-doped titanium dioxide was prepared at 1300℃. The results show that the optimum up conversion luminescence can be obtained with the titanium dioxide that was doped with 39La2O3–10Yb2O3–1Er2O3 (in units of wt %) and excited with 1064nm excitation source at room temperature, And the bright green light can be seen by naked eyes in day-time.
  • Research on absorbing properties of electromagnetic modified resonance- cement -based composite
    . 2012, 43(S1): 27-0.
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    fly ash floating beads and closed cell perlite were coated by graphite and ferrite respectively, and then it was compared of the microscopic changes of the surface of fly ash floating beads and closed cell before and after modification by SEM. Results show that graphite and ferrite，respectively，distributed uniformly on closed cell perlite surface, in which continuous glaze surface and special honeycomb structures distribute alternately and formed the good performance resonant absorber. Modified ash floating beads and closed cell perlite mixed with cement-based materials to form cement-based absorbing composites, and then it was measured that radar reflectivity of the cement-based absorbing composites in S~C and X~Ku by using RCS to study the absorbing performance. The results show that compared with the modified fly ash floating beads by coating, the modified closed cell perlite by coating was more effective to improve the absorbing properties of the cement-based composites, and broadened -10dB bandwidth. It is significance to further the practical application of the cement-based composites.
  • Synthesis and Characterization of FA-CS/SWCNTs Composites by Electrostatic Self-assembly
    Min Zhou;;;;;
    . 2012, 43(S1): 28-0.
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    Carboxylated single walled carbon nanotubes were obtained by treat with mixed acid oxidation method. Folic acid (FA) modified chitosan (CS) was prepared by the interaction between the amino group of CS and the EDC activated FA. And FA-CS/SWCNTs composites were self-assembled SWCNTs with folate FA-CS by electrostatic attraction. The resultant composites were biocompatible and can target delivery drug to cancer sites. The corresponding composites were characterized by FT-IR, XPS, SEM and TG analysis. The results showed that FA-CS/SWCNTs composites were successfully synthesized by self-assembly and the hydrophilic property, security and target activity was improved by the inducing of FA-CS molecular chain. TG analysis demonstrated that 35% of FA-CS was attached onto the surface of SWCNTs, and the FA to chitosan ratio was 8.1%. Because of the properties the FA-CS/SWCNTs composites have great potential to be used as targeted drug delivery carrier in the field of drug release areas.
  • Intermediate Temperature Electrical Properties of Sn1-xScxP2O7 (x = 0.03)
    . 2012, 43(S1): 29-0.
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    Sn0.97Sc0.03P2O7 was synthesized by a solid-state reaction method，and the conduction behaviors were investigated by some electrochemical methods including AC impedance spectroscopy, gas concentration cells in the temperature range of 50 ~ 250 ℃. The highest conductivity was observed to be 1.51×10-2 S?cm-1 under wet H2 atmosphere at 175 ℃. The result of water vapor concentration cell indicated that the sample has the existence of oxide ionic conduction under wet H2 atmosphere and mainly protonic conduction under wet O2 atmosphere. The H2/air fuel cell using Sn0.97Sc0.03P2O7 as an electrolyte generated the maximum power density of 11.16 mW?cm-2 at 150 ℃.
  • Study on the Leaching Rules of Aluminum and Ferrum from High Iron Bauxite by Acid Leaching at Low Temperature
    . 2012, 43(S1): 30-0.
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    The rules of dissolved aluminum and ferrum from high iron bauxite from Guangxi province by acid leaching at low temperature were studied. The factors of sulfuric acid concentration, leaching temperature, leaching time and liquid-solid ratio were investigated. Results shows that ferrum and aluminum in bauxite are step- leached by sulfuric acid solution on the conditions of that the sulfuric acid concentration is 20%, leaching temperature is 100℃, leaching time is 1h and liquid-solid ratio is 5:1. On these conditions, the quantity of ferrum leached is 98.68% and that of aluminum is 3.02%; its ratio is 32.68. The kinetic analysis reveals that the leaching process is controlled by chemical reaction. The activation energy Ea is 35.11kJ/mol, and the leaching dynamic equation is as follow: .
  • Testing of Asphalt Mixture Thermal Conductivity and Its Influences on Asphalt Pavement Temperature Field
    . 2012, 43(S1): 31-0.
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    Accurate temperature filed estimation is crucial to asphalt mixture’s visco-elastic analysis and rutting depth calculation. Temperature filed estimation is closely related to pavement layers’ thermal physical parameters. Therefore, precise testing of asphalt mixture physical parameters becomes more and more important. Among the thermal physical parameters, testing of thermal conductivity is given special attention because it’s one of the most commonly used parameters of asphalt mixture. Hot wire method is considered a suitable method in testing HMA thermal conductivity coefficient and its testing principle is introduced. Thermal conductivities of four types of asphalt mixtures with different gradation are tested using transient hot wire method. And its influencing factors are analyzed. An asphalt pavement structure is modeled and its temperature field distribution is calculated using finite element software ABAQUS. Based on the calculation, it is found that asphalt pavement temperature filed distribution changes with the change of thermal conductivities of the top layer, mid layer and bottom layer. It can be seen from the simulation result that thermal conductivity of the top layer has a significant influence on temperature distribution of the pavement structure. It can be anticipated that it’s possible to improve asphalt pavement temperature field by changing top layer thermal conductivity.
  • Fabrication of Photonic Crystals Film of Far Infrared and Laser Band Compatibility Based on Flexible Acrylic Substrate
    . 2012, 43(S1): 32-0.
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    Currently, photonic crystals (PCs) film primarily deposited on the rigid substrate. But it must be prepared on flexible materials if the PCs applied to military equipment. The reflection and transmission spectra of the PCs designed are calculated by characteristic matrix method of thin-film optical theory. The PCs film is actually prepared on flexible materials acrylic by plating film method and the spectrum is tested .The testing result shows that the PC which prepared on the flexible substrate can achieve far infrared and 10.6 laser band compatibility.
  • Comparative study between the normal concrete mixing and tow-stage mixing approach with different consistency
    . 2012, 43(S1): 33-0.
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    Concerning the definition of terms characterize the concrete mixing uniformity：the average value and coefficient of dispersion which decided by the standard concrete compressive strength. The time when the coefficient of dispersion stabled regarded as the mixing complete. The consistency varied by changing the composition of concrete. In the condition of using the normal mixing way, measuring the concrete with different consistency, the mixing time needed was nearly obey: pasty concrete＞stiff concrete＞plastic concrete. The result also indicating that reducing water content, increasing sand ratio, increasing powder content prolong the mixing time. In the condition of using two-stage mixing approach(mortar mixing 30s+concrete mixing 30s), the strength increased, coefficient of dispersion reduced and the efficiency of concrete mixing have improved. So that the two-stage mixing approach will increase the specific yield of concrete, solve the problem of low production of concrete which was difficult to mix.
  • Polyol synthesis of carbon nanopartilces with high specific area
    HAO WU ;
    . 2012, 43(S1): 34-0.
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    A polyol synthesis method is developed for preparation of amorphous carbon nanoparticles with high specific surface area under ambient atmosphere by the reaction of ferrocene and ammonium bromide in triethylene glycol (TREG) at 200℃.Samples are characterized by X-ray diffraction (XRD), field-emission scanning electron microscopy (SEM), transmission electron microscopy (TEM) and N2 adsorption-desorption isotherms. It is found that the nanoparticles are complete amorphous and agglomerate together due to the strong surface tension. The amorphous carbon nanoparticles with a diameter of 30-70 nm have a wide size distribution of mesopores with a Brunauer-Emmett-Teller (BET) surface area of 578.68 m2/g. It is proposed that the dissolved reactants uniformly dispersing in the TREG could react at a molecular level to form uniform carbon nanoparticles.
  • The electrodeposition of CuInSe2 adsorb layers in low In ions electrolytes
    Hu Fei
    . 2012, 43(S1): 35-0.
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    The cathodic electrodeposition behavior have been investigated by linear sweep voltammetry, and it is found that the addition of sodium citrate could decrease the reduction current of Cu2+, and the addition of H2SeO3 has assimilation effect for the reduction of Cu2+ and In3+. The one-step potentiostatic electrodeposited CIS thin films have great deviation from the ideal stoichiometric ratio of 1：1：2, and two-step electrodeposition has shown a near-toichiometric ratio. After annealing in nitrogen atmosphere, the CuInSe2 (CIS) thin films have shown chalcopyrite structure with band gap of 1.06 eV.
  • The Optimization of bovine tendon collagen fiber extraction conditions and structural characterization of collagen fiber
    Wei-hua Dan
    . 2012, 43(S1): 36-0.
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    Collagen fibers were extracted by acid swelling-pepsin digestion method from bovine tendons. Compared with the extraction rate of the collagen fibers and the content of soluble collagen in the collagen fibers under the conditions of different time, pH, the enzyme dosage, the optimum project was arrived at. Then collagen fibers were characterized by SDS-PAGE, FT-IR spectra , Differential Scanning Calorimeter (DSC) and Atomic Force Microscope (AFM) , Scanning Electron Microscopic(SEM) . The result shows that the optimized conditions were 40h，pH2.5, 1.0% pepsin. Relatively collagen fibers both had high extraction ratio and high molecular weight. The tests of DSC revealed that the denature temperature of collagen fibers was 66.7℃. The pore sizes of collagen fibers were about 100~300μm by SEM. With the AFM observed, we drew a conclusion that the aggregation state of collagen fibers was complex including a single fiber and fiber bundles structure. SEM also confirms the conclusion of AFM. As a consequence, the collagen fibrils sustain original triple helix structure.
  • Study on Performance of Acoustic Encapsulation Materials and Application Effects on Vehicle
    . 2012, 43(S1): 37-0.
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    As the main method of passive noise reduction on vehicle, acoustic encapsulation plays an important role on improving of vehicle’s NVH performance. The core technology of acoustic encapsulation is acoustic materials’ applications, the effects of acoustic encapsulation depends largely on the degree of the materials application’s level. In this article, the performance of damping and absorbing materials is compared respectively, the influence of component and sorts on acoustic performance of damping materials is researched, also the influence of sorts and specifications on acoustic performance of absorbing materials is researched. The acoustic encapsulation project has be formed by using the high performance materials which has be chosen to improve test vehicle’s NVH performance. Furthermore, the improving effects on vehicle interior noise bv using materials has be analyzed and evaluated.
  • Effect of Heat Treatment on the Properties of High Wear Resistance Material of NiTi
    . 2012, 43(S1): 38-0.
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    By utilizing the test of the optics metallographical and microhardness, this paper researches the influence on performance of high wear resistance material of NiTi by heat treatment. The result shows the microhardness of wear resistant of NiTi has obvious changed over different heat treatment. When we do heat treatment at 800℃×30min /WQ+300℃×240min /FC ,we get the highest number of microhardness. After solution heat treatment at 800℃ , the fishbone crystals gradually increased but linear crystals gradually decreased with the extension of time about 300℃. Black mass point gradually increased which made higher strengthen of the matrix crystal and improved of the material microhardness. The crystals refined with the different cooling motheds.
  • Synthesis and Crystal Structures of Manganese (II) Coordination Compounds of Large Ring Framework With a Bidentate Betaine Derivative
    Jia Xue LIUYu XIONG;Lu LIANG
    . 2012, 43(S1): 39-0.
    Abstract ( ) Download PDF ( ) Knowledge map Save
    A new bidentate betaine derivative 1,5-bis(4-carboxypyridinium)-N-methyl-diethylamine (L) was prepared and allowed to react with manganese salts leading to the formation of one new manganese coordination compounds {[MnL2Cl2].2H2O}n which was structurally characterized by IR spectoroscopy，single-crystal X-ray diffraction,. The single crystal X-ray diffraction structure analysis of these compounds shows the molecule consists of discrete 36-membered ring structure. Owing to lacking strong intermolecular interactions in these compounds, weak interactions determine their packing pattern in crystalline state, such as π-π stacking and hydrogen bonding interactions.
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